If you're looking for a simple way to keep your notes, outlines, and pretty much any other text in sync across computers, Fargo is a webapp that runs in any browser and syncs with Dropbox.

Fargo is essentially a text editor built for outlining ideas. That means you can use it to organize projects, to-do lists, or as a regular old notepad. The outliner function makes it so you can easily expand certain sections, hide them, and organize it all better. Files are then saved on your Dropbox and locally as an HTML 5 file.